Hilliard, FL has a population of 3,131 and is the 8,589th largest city in the United States. The population density is 575 per sq mi which is 96% higher than the Florida average and 535% higher than the national average. The median age in Hilliard is 38 which is approximately 9% lower than the Florida average of 42. In Hilliard, 61% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 60% of Hilliard residents were born in Florida, 39% were born out of state, 1% were born outside of the United States and 0% were foreign born.